Abrasive Blasting Pots

The base unit for all blasting projects that require portability and flexibility.
The blasting pot for any project is the key component that needs to be supported by the correct equipment and accessories. If you have the correct blast unit with the right moisture removal system, nozzle and hoses, any project can compete at the highest level of productivity.

Components of a blast pot

1 Pressure vessel

When blasting, the air pressure in the vessel or chamber of the machine is the same as the hose connected to the nozzle. This means that there is no pressure differential between the blast pot and the blast line – this allows the abrasive media to meter into the air stream at the blast pot and then run the length of the blast hose out to the nozzle.

Using a pressure vessel the unit can project a greater media velocity for greater abrasive particle velocity which results in faster cleaning of tough contaminants.

More abrasive particles are propelled against the work surface per minute, for a given nozzle size. This translates into higher productivity, particularly on difficult applications.

As the abrasive particles are moving under pressure, there is an increase to the stand-off distance of the blast nozzle from the working surface, producing a larger blast pattern area, while still achieving velocities with enough impact to remove contaminants from the surface of the target.

2 Metering Valve

It is a common misconception that in a pressure blasting unit the abrasive is pushed out of the pressure vessel and through the hose to the blasting nozzle. In reality, the abrasive is metered through an abrasive “grit” valve into a compressed air stream that passes through the bottom of the valve. The blast pressure vessel needs to be under the same pressure as the air flow to the nozzle if the abrasive is to pass through the metering valve correctly and into the air stream.

3 Deadman Safety System

Two systems are commonly used for this important part of the process. These are electric, which uses a safe 12 volt system, or pneumatic, which uses compressed air from the pot. Both have design advantages.

4 Moisture Separator

It is important that a moisture removal component is added to the system to capture any moisture particles in the compressed air supply. Moisture in the system can cause the abrasive to clog, thereby slowing down the blasting speed and may in some cases cause the freshly blasted surface to prematurely develop rust.

Moisture separators can come as an attachment for the blasting unit itself, or for the highest efficiency, BlastOne recommends the use of a secondary AirPrep Compressed Air Drying unit.

M-Series & S-Series Blasting Pots – Which should I use?

The M-Series multi-media blasters add flexibility to your blasting operation. They are designed to be used with a broader range of abrasive media than a typical blaster, allowing you to achieve the surface profile you need because you can use the abrasive best suited for the job. Now you can use a single system for all your jobs - from cleaning surface grease and oil to stripping rust or paint.

The key to these systems is in the easy to use, precision controls. The M-Series have features to allow for blasting at high or low pressure, as well as features for improved abrasive flow and flow control. These include a pressure regulator to reduce blast air pressure when working with delicate objects, full pressure bypass for working with tougher applications and differential pressure control for enhanced operation when blasting with lightweight abrasives.

The S-Series portable abrasive blasting systems are the workhorses of the abrasive air blast industry. These blasters are designed to provide the industry's lowest pressure drop - less than 1.5 psi and in some cases less than 1 psi - compared to as much as 10-14 psi in other systems on the market. It is important to note that for every drop of 1 psi at the nozzle, there is a corresponding loss of 1.5% in productivity. With sizes ranging from 1 cubic foot through to 20 cubic feet, and a wide range of available options, make these systems fully customizable for any blasting operation. These pots provide more value for contractors and industrial users, especially with expensive media and abrasive air blast labour that is harder to find.

What capacity blasting pot is needed?

The first thing to consider is what the blast pot will be used for. Blasting is used in so many applications, it would be impossible for us to list them all here but there are a number of factors appl

Size of the blasting pot.

For big projects, you will most likely require a large capacity blast pot (e.g. 6.5 or 10 cub ft). This will mean that you can blast continuously for longer without refilling. For smaller projects and occasional work a smaller capacity pot like a 1, 2 or 3.5 cubic foot pot will be sufficient and will offer more manoeuvrability than the larger models. If you are planning to use the pot for site work, the smaller, more manoeuvrable pots will most likely serve you better than the larger pots, which are better suited to in-house work.

Pressure capacity of the blasting pot.

Of course every job is different but to give you a rough idea of the amount of pressure you will require, here are some examples of what can be achieved at different levels of psi:

  • 60 psi – Useful for cleaning soft wood and lightly soiled stone and etching some metals.
  • 80 psi – Useful for cleaning heavily soiled stone and etching steelwork.
  • 100 psi – Useful for mill scaled or rusted steel and iron.
Location of the blasting site.

The next step is to think about where you will be blasting. Whether you’re working outside, in-house, offshore or on restricted sites, there are a number of key factors that will determine the type of blast pot needed for different applications.

What sort of site access do you have?

If you’re often required to work on particularly rough or rocky ground, then the Redline contractor range can provide a more robust blasting solution as it features large rugged wheels for manoeuvrability. Both the Redline and Airblast Premium ranges feature lifting eyes for added mobility.

What sort of transport do you have?

If you’re going to be using your blast pot for site work, it’s very important to consider how you’re going to transport it. Our smaller blast pots, the 1.0, 2.0 & 3.5, will fit in small vans and can be loaded by a two-man team. The 6.5 pots models will require a larger vehicle to transport them. They are also heavier and will usually need to be loaded using a tail lift or a three-man team.

Portable or stationary?

You need to consider whether you need a portable blast pot or whether a stationary one will be suitable. Stationary units are generally big and can offer you a longer period of continuous blasting before they need to be refilled but they are also cumbersome and not as easy to move around a site. The smaller more portable units are much better suited to site work. The smaller S-Series range of pots are specifically designed for contractors and are ideal for this type of application.

Compressor air unit size

To achieve the right level of pressure, you will need to choose the right size of compressor and combine it with the optimum nozzle for that size. How long do you want to be able to blast at a time? Different sized pots offer longer duration of continuous blasting. However, longer blasting duration are usually reflected in the size of the pot, so you may need to sacrifice blasting duration for manoeuvrability.

What else do you need?

Do you need a full package blast pot or do you already have some parts? Blast-One offer a range of blast pot packages which can include as much or as little as you need. You can either buy the blast pot with just a moisture separator, or you can buy various packages which include blast hoses, couplings, nozzle holders, deadman lines, deadman handles, breathing filters, breathing lines, blast gloves and blast helmets.

For blasting applications where multiple units Bulk Blasting units might be a better fit.

When should you use a Bulk Blasting Unit?

When blasting requirements exceed the capability and capacity of the smaller units, consider investing in a bulk blasting unit. With conventional pots, the blasting has to stop every hour or so to refill the Blast Machine. This ‘down-time’ during refilling adds up in inefficient operation. The bulk blasting units hold enough abrasive for 2-4 operators to blast all day without stopping. Because the pot doesn’t depressurize and refill with compressed air during the day, it also greatly reduces moisture and condensation problems. Bulk blasters are designed to maximize the cost savings of volume production. These high productivity blasting systems feature multi-outlet controls valves that allow each operator to independently control of their abrasive media flow. Bulk blasting units include all the safety and performance features expected from a high performance abrasive blast machines.